Anesthetizing apparatus



Patented Apr. 24 1928 UNITED STATES;

PATENT osr cs.

JAY A. HEIDIBBINK, OI IINNEAI'OLI S, IINNEBO'IA.

ANESTHITIZING APPARATUS.

' Application filed nuns-{23,1924 Serial No. 694,465.

ject in particular is to provide means whereby a plurality of gases suchas nitrous oxid and oxygen maybe readily delivered from independentsources ofvsupply in such man= ner that the flow of oxygen for mixingwith the nitrous oxid willbe automatically controlled by the quantity ofnitrous oxid being delivered so that the percentage of oxygen in themixture .will be the same for dif-- 'ferent adjustments for thenitrous-oxid control. Another object is to provide means in combinationwith apparatus of this character whereby either nitrous oxid or oxygenalone my be administered when desired.

' .The full objects and-advantages of my invention will appear inconnection with the detailed description, and the novel features of myinventive idea will be particularly pointed out in the claims.

In the accompanying drawings. which illustrate one form in which myinvention may be embodied,Fig. 1. is a top plan view of the apparatus.Fig. 2 isa view in vertical section on theline 2-2 of Fig. 1. Fig. 3 isa-view in vertical section on the line 33 of Fig. 1. Fig.4 is a view invertical section on the line 4-4 of Fig 1. Fig. 5 is a view inhorizontal section on the line 5-5 of Fig. 2." Fig. 6 is a view invertical section on the line 6-6 of Fig. 5. t Fig. 7-is a view invertical section on the line 77 of Fi 5. a

' is shown in the drawings, there is a pair of arms 14 and 16, the outerends of which are provided with yokes' 18 and 20 within which heads ofgascontainers 22 and 24 are adapted to be secured by set screws 26 and28. The container 22 is intended for holding oxygen and the'container 24is intended for holding nitrous oxid. The arms 14 and 16 containlongitudinal passagewa' s 30 and 32 as shown in Fig. 2, with whic thegas containers are adapted to be placed-in coIn-.

munication by means of needle valves 34 and 36 which constitute reducingvalves. The arms 14 and. 16 extend out from a central member 38 which isprovided with' a socket 40 for-receivingthe u per end of a standard 42.Controlling devices designated in'general by the numerals 44 and 46 arearranged for cooperation respectively with the passageways 30 and 32,the inner ends forations 48 and 50. The blocks 60 an are heldresiliently upward by springs 68 T of which communicate with downwardlyturned perforations 48 and 50 formed in blocks 52 and 54 rigidly securedin tubular members 56 and 58forming part of the con- 60 trolling devices44 and 46 and constructed integrally with the central member 38.Slidable blocks 60 and 62 are positioned in the tubular members 56 and58 and the upper ends of these blocks are provided with annu- Cl larflanges 64 and 66 containing fiber plugs adapted to engage the outletends of the er and 7 0,. and these blocks may be depressed 70 bystaplelike members 72 and 74 whichextend loosely through openings formedin the fixed blocks 52 and 54- as will be apparent from Figs. 6 and 7The staple 74 at its 11 )per end isengaged by the lower surface 7 o ad1aphragm-76 forming the upper wall of a chamber 7 8. A coiled springrests upon the=upper surface of the diaphragm 76 and the tension of thisspring. ma be regulated by a screw 82. The chamber 8 is 80 provided withtwo outlet openings, one of which indicated at 83 and best shown in Fig.3 is connected by a tube 84 with an inlet port 86 formed in a valvecasing 88 attached to the central member 38,as shown in 00 Fig. 4 andcontaining a mixing chamber .90

having upper and lower walls 92 and '94 which contain openingscontrolled by a double ended valve'96 having an upwardlyex- -tendingthreaded stem 98 to which is secured lo a knurled head 100 by which thevalve may be turned so as to entirely close, either the opening in thewall 92 or the opening in the wall 94. When one of these openings isclosed the other one will be uncovered, while by placing the valve inintermediate position both of these openings will be uncovered. Theport.86 for admission of nitrous oxid opens into a space above the upperwall 92. The other outet from the chamber 78 pre viously referred to andwhich is indicated at 101' in Fi 2 is connected by a tube "102 with a,cham 1'- 104 in the upper portion of the controlling device 44 foroxygen. The

.lower'wall of the chamber 104 is formed by 105 a diaphragm 106 whichconstitutes the upper wall of a chamber 108, this latter chamher beingprovided with a'relief valve 110 as shown in Fig. '2'. Referrin to Figs.2 and 7, it will be seen that a dis 112 is enno gaged with the lowersurface of the diaphragm 106. The disk 112 is mounted on one end of alink 114, the other end a which pivotally attached to a bracket 116. The

114 engages the free end of a lever 118 whose intermediate portionengages the top .of the staple 72. It is obvious that as the ressure ofnitrous oxid in the chamber 7 8 is increased, the sliding block 60 willbe depressed to a greater extent, thus allowing more oxygen to flow outof the lower end of the perforation 48 and up through the openings whichcontain the arms of the staple 72 so that the oxygen is delivered to thechamber 108 which has an outlet port connected by a tube 120 with aspace 121 in the casing 88 below the lower wall 94. When the valve 96 isin intermediate osition, nitrous oxid will pass into the mixing chamber90 from above and oxygen will pass into will be seenthat the oxygenchamber 108 is connected to a gauge 126 which registers the percentageof oxygen in the mixture when a mixture of oxygen and nitrous'oxid isbein administered while by reference to Fig. 6 It will be seen that thenitrous oxid chamber 78 is connected to a gauge 128 which registers thenumber of gallons of nitrous oxid being delivered per minute. A stop arm130 is secured to the knurled head100. When this arm'engages the lefthand side of a finger 132 secured to the valve casing 88,- the valve 96closes the opening through the lower wall 94 and nitrous oxid only isallowed to pass into the chamber 90 for delivery to the inhaler. Whenthe knurled head 100 is turned to bring the stop arm into engagementwith the right'hand side of the finger 132, the valve 96 closestheopening through the upper wall 92 and oxygen only is allowed to passinto the chamber .90 for delivery to the inhaler. -When the stop arm 130is in intermediate position, theppenings be uncovered and a mixture. ofthe two gases will be delivered to the inhaler. As previously explained,the controlling device 44 for oxygen is automatically governed by thepressure bf the nitrous oxid which is regis-- tered-on the gau e 128 innumber of gallons per minute and t e amount of which maybe 'readilyvaried by. means ofthe screw 82.

The percentage ofoxygen .in the mixture is therefore, the same fordifferent adjustments of the controlling device for nitrous oxid. It isobvious that as soon as. the knurled head 1O0'isturned toward the rightfrom thepositionshown in' Figs. 1 and -5,- a small amount of oxygenwillbe admitted to the mixingchamber for mixing with the ply of nitrous oxidbeing entirelyshut oif when the arm 130 engages the right hand side ofthe finger 132. At an intermediate position of the head 10 the valve 96will be opened equally at top and bottom. If desired, suitablegraduations' may be placed on the head 100.. Proportioning' of the gasesis controlled with the greatest facilitg' by irecturning the head 100 inthe propertion. Furthermore, when the patient is being supplied with amixture of the gases in the desired proportions, it is an easy matter toturn thehead 100 to its left hand limit so' as to give the patient a fewwhifis of pure nitrous oxid to obtain more complete anaesthetizing andthen turn the head 100 toward the'right so as to re-establishadministering the mixture in the desired proportion. L

I claim:

1. An anaesthetizing ap aratus having a mixing chamber, two in ependentsources of supply of gases under pressure connected with said mixingchamber,.a controllin de vice in one of sa d connections, a controllingdevice in the other of said connections, a diaphragm in saidfirstcontrolling device cona diaphragm in, said second controlling de-,

vicejconstituting a partition between two separated gas chambers, apassageway conmeeting said first mentioned gas chamber with .one of saidseparated gas chambers,

the other of said separated gas chambers bemg in the connection betweenits source of supply and the, mixing chamber, a. valve for controllingthe supply. of gas to said last mentioned chamber and connectionsbetween said second "diaphragm and said valve for opemng the latter toan extent in proportion to the pressure of gas in the first of ,saidseparated chambers. through both the upper and lower wallswill of supplyof gases under pressure connected with said mixing chamber, acontrolling device in one of sad connections, said controlling devicehaving a diaphragm which constitutes one of the walls of a gas chamberwhich is connected to said'mixing chamber.

and said controlling device having means associated with said diaphragmfor varying the supply of gas to said chamber, a controlling device inthe otherof said connections, said second controlling device having adiaphragm which constitutes a, partition between two separated gaschambers, a valve whlch controls the supply of gas to one of saidseparated chambers and connecting means between said second diaphragmand valve whereby the latter will beopened to an extent in proportion tothe pressure of gas in the other of said separated chambers, apassageway connecting said last mentioned separated chamber with thechamber of said first controlling device, said mixing chamber havingseparate entrance ports for the gases which pass said controllingdevices, and 10 means operable at will to completely close either ofsaid ports and to progressivelyopen either of them as the other one isprogressively closed.

In testimony whereof I hereunto aflix my

